Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
  • F04D29/00—Details, component parts, or accessories
  • F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
  • F04D29/68—Combating cavitation, whirls, noise, vibration or the like; Balancing by influencing boundary layers
  • F04D29/681—Combating cavitation, whirls, noise, vibration or the like; Balancing by influencing boundary layers especially adapted for elastic fluid pumps
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
  • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
  • F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
  • F01D5/12—Blades
  • F01D5/14—Form or construction
  • F01D5/141—Shape, i.e. outer, aerodynamic form
  • F01D5/145—Means for influencing boundary layers or secondary circulations
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
  • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
  • F01D9/00—Stators
  • F01D9/02—Nozzles; Nozzle boxes; Stator blades; Guide conduits, e.g. individual nozzles
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
  • F04D29/00—Details, component parts, or accessories
  • F04D29/40—Casings; Connections of working fluid
  • F04D29/52—Casings; Connections of working fluid for axial pumps
  • F04D29/522—Casings; Connections of working fluid for axial pumps especially adapted for elastic fluid pumps
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
  • F04D29/00—Details, component parts, or accessories
  • F04D29/40—Casings; Connections of working fluid
  • F04D29/52—Casings; Connections of working fluid for axial pumps
  • F04D29/54—Fluid-guiding means, e.g. diffusers
  • F04D29/541—Specially adapted for elastic fluid pumps
  • F04D29/542—Bladed diffusers
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
  • F04D29/00—Details, component parts, or accessories
  • F04D29/40—Casings; Connections of working fluid
  • F04D29/52—Casings; Connections of working fluid for axial pumps
  • F04D29/54—Fluid-guiding means, e.g. diffusers
  • F04D29/541—Specially adapted for elastic fluid pumps
  • F04D29/542—Bladed diffusers
  • F04D29/544—Blade shapes
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
  • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
  • F05D2240/00—Components
  • F05D2240/10—Stators
  • F05D2240/12—Fluid guiding means, e.g. vanes
  • F05D2240/127—Vortex generators, turbulators, or the like, for mixing
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
  • Y02T50/00—Aeronautics or air transport
  • Y02T50/60—Efficient propulsion technologies, e.g. for aircraft

Definitions

• the present invention relates to the field of turbomachines, and in particular a turbomachine element comprising a blade with a plurality of vanes offset from each other in a lateral direction and vortex generating devices arranged upstream of said vane in an axial direction perpendicular to said lateral direction.
• turbomachine means any machine in which energy transfer can take place between a fluid flow and at least one blade, such as, for example, a compressor, a pump or a turbine, or else a combination of at least two of these.
• a turbomachine may comprise several stages, each stage normally comprising two blades, namely a moving blade and a righting blade.
• Each blade has a plurality of vanes offset from each other in a lateral direction. Typically, these vanes are arranged radially about a central axis.
• blading forms a rotor, when it is a mobile blade, or a stator, when it is a straightening blade.
• each blade is typically connected to an inner shell by a proximal end, or blade root, and to an outer shell by a distal end or blade head.
• the inner and outer shells are normally substantially coaxial, as illustrated for example in the French patent application with the publication number FR 2 896 019.
• Each blade has an aerodynamic profile with an upper surface, a lower surface, a leading edge and a trailing edge which, in operation, are subjected to the flow of a working fluid.
• upstream and downstream are defined relative to the normal flow direction of this working fluid.
• detachments of this flow from the extrados may occur.
• a three-dimensional detachment can occur, forming a so-called "corner whirlwind”.
• This corner swirl is generated by low particle accumulation kinetic energy in the corner formed by the extrados and the inner shell forming the base of the dawn. It notably causes a loss of significant efficiency of the compressor.
• the vortex generating device provides the least resistance to the flow of the working fluid, so as to minimize aerodynamic losses.
• this device should preferably locally redirect the flow of the fluid, so as to direct the vortex it generates to the extrados.
• the present invention aims to remedy these drawbacks and to propose a turbomachine element comprising a blade with a plurality of vanes offset from one another in a lateral direction and vortex generation devices arranged upstream of said blade in a perpendicular axial direction. at said lateral direction to effectively reduce local detachments to the upper surfaces of the blades with reduced aerodynamic losses, but whose manufacture is facilitated.
• this object is achieved by virtue of the fact that the turbomachine element comprises a a plurality of vortex generation devices upstream of one end of each vane, the vortex generating devices of each set being offset both laterally and axially between them.
• each set may comprise at least three vortex generating devices.
• each blade makes it possible to redirect the vortices generated by them towards the upper surface of the blade, even if each individual device is oriented with a reduced angle of attack, for example between 5 and 15 degrees, relative to the fluid flow, in order to minimize its resistance, and has a simple shape to facilitate its production.
• the vortex generating devices comprise at least one fin.
• the fin may have a substantially straight rope.
• Such a fin can form a vortex generating device particularly simple to manufacture.
• other types of vortex generating devices could also be considered alternately to the fins or in combination therewith.
• at least some of the vortex generating devices may have at least one notch formed in a blade end holder.
• the vortex generation devices have substantially parallel orientations, which further simplifies the manufacture of vortex generating devices, while limiting aerodynamic losses.
• the blades of the blade of the turbomachine element are arranged radially about a central axis.
• the turbomachine is adapted so that the moving blade rotates about this central axis.
• other forms of turbomachine with, for example, a linear displacement of the blades, are in principle possible.
• each blade has a proximal end called blade root, and a distal end called blade head.
• a A set of multiple vortex generation devices may be located upstream of each blade root.
• corner vortices are more likely to form at the base of the blade, the usefulness of vortex generating devices is greater at this location.
• a set of several vortex generating devices may also be located upstream of the blade head. Although corner vortices are less likely to form at the top of the blade, the vortex generating devices may also be possibly useful for combating such a phenomenon there.
• the blading of the turbomachine element is a rectification blade.
• a compressor and particularly in a high-pressure compressor, corner vortices are more likely to form at the level of the righting vane.
• the turbomachine element may comprise a mobile vane, and in particular a rotor, and such vortex generating devices arranged upstream of the moving vane in order to fight the formation of corner whirls.
• the vortex generating devices can be integrally formed to the vane, for example by incorporating their shape into a casting mold of the vane and / or by machining them in the mass. Alternatively, however, they can be produced separately and fixed in front of the blades. In each case, the height of the vortex generating devices may in particular be of the order of 2 to 8% that of the blades directly downstream of these.
• the present description also relates to a turbomachine comprising at least one turbomachine element according to the invention.
• This turbomachine may be a compressor, a pump, a turbine, or a combination of at least two thereof, such as, for example, a turbojet, a turbine engine, a turboprop, a turbopump and / or a turbocharger.
• said turbomachine element can be an element of compressor.
• this turbomachine element could alternatively be a pump or turbine element.
• FIG. 1 shows, schematically, a longitudinal section of a compressor of the prior art
• FIG. 2 shows schematically a perspective of a blade of the compressor of Figure 1, subjected to a corner vortex
• FIG. 3 shows schematically and in perspective, a segment of a compressor element according to a first embodiment
• FIG. 4 schematically shows a developed sectional view of the segment of Figure 3 along the curved plane IV-IV;
• FIG. 5 schematically shows a longitudinal sectional view of the segment of Figures 3 and 4 along the line V-V;
• FIG. 6 schematically shows a longitudinal sectional view of a compressor element according to a second embodiment
• FIG. 7 schematically shows a longitudinal sectional view of a compressor element according to a third embodiment
• FIG. 8 schematically shows a longitudinal sectional view of a turbine stage formed by a turbine stator according to a fourth embodiment and a turbine rotor according to a fifth embodiment.
• FIG. 1 is illustrated a turbofan engine and, in greater detail, a stage 1 of its high pressure compressor.
• This compressor stage 1 typical of the prior art comprises two main parts: a rotary mobile blade called rotor 2, and a fixed stator 3 rectifying blade. Both in the rotor 2 and in the stator 3, the blades 4, 5 are arranged radially about a central axis X.
• each blade 4 of the rotor 2 has a proximal end 4a, said blade root, integral with a rotary hub 6, a distal end 4b, said head blade, adjacent to a fixed outer ring 7 of a compressor housing 1.
• each blade 5 of the stator 3 has a proximal end 5a, also called blade root, integral with a fixed inner ring 8, and a distal end 5b, also called blade head, integral with the outer shell 7.
• the rotation of the blades 4 of the rotor 2 about the central axis X impels the working fluid, normally a gas or a mixture of gases such as air, at the same time in an axial direction parallel to the central axis X, and circumferentially in a lateral direction perpendicular to the axial direction.
• the blades 5 of the stator 3 straighten the flow of the working fluid in the axial direction and, in doing so, transform a large part of the dynamic pressure of the working fluid into static pressure.
• FIG. 2 A particular problem of such a compressor stage 1 is illustrated in FIG. 2.
• the confluence of the boundary layers of the extrados 5c and the inner ferrule 8 produces a low energy zone that can cause a detachment 9 called "corner swirl".
• This vortex corner 9 has a clearly negative impact on the aerodynamic performance of the compressor 1.
• stator 3 it can be further exacerbated by a recirculation of the working fluid, under the inner shell 8, downstream upstream of the stator 3, generating a leakage flow rate between the hub 6 of the rotor 2 and the inner shroud 8, leakage rate which disturbs the flow of the driving fluid directly upstream of the vanes 5 of the stator 3.
• corner vortices can also form on the blades 4 of the rotor 2, and both in the rotor 2 as in the stator 3, they can be formed both at the blade root as the blade head.
• FIG. 3 illustrates a first embodiment in which a compressor element 100 comprises a straightening vane 103 in the form of a stator, with a plurality of blades 105 arranged radially around a central axis X, and offset from each other in a lateral direction, that is to say circumferential.
• This compressor element 100 is intended to be situated directly downstream of a rotor (not shown) rotating around the central axis X, in order to straighten the flow of the working fluid downstream of the rotor towards a substantially parallel axial direction. to the central axis X and perpendicular to the lateral direction.
• each blade 105 has a blade root 105a integral with an inner shell 108, and a blade head 105b integral with an outer shell 107.
• the compressor element 100 In order to prevent, at least partially, the formation of a corner vortex at the blade root 105a, between the upper surface 105c and the inner shell 108, the compressor element 100 according to this first embodiment also comprises a set of three devices 115 for generating vortices upstream of each blade root 105a, in the form of straight fins integral with the inner ring 108.
• the shape of these fins 115 being comparatively simple, their manufacture, even in an integrated way to the inner ferrule 108 does not pose particular problems with the manufacturing processes known to those skilled in the art.
• They may in particular have been molded in one piece with the inner ferrule 108 and the rest of the righting vane 103, and possibly have been subjected to a recovery finish at the foundry outlet, or have been manufactured separately and then fixed by conventional means on the inner shell 108. Alternatively, however, they may have been machined in the mass of the inner shell 108. Typically, their height may be of the order of 2 to 8% of that of the blades 105.
• these fins 115 are substantially parallel to each other and have an angle of attack a, which can be, for example, between 5 and 15 degrees, relative to the direction of the flow E working fluid upstream of the stator 103, so as to generate vortices downstream of each fin 115, but without exhibiting excessive resistance to this flow. They also have an angle ⁇ with respect to the lateral direction. Between them, each pair of adjacent fins 115 has an axial offset d x and a lateral offset d y . The alignment of the fins 115 therefore has an angle by relative to the lateral direction which, in the illustrated embodiment, is substantially greater than the angle ⁇ .
• the axial and lateral offsets of the fins 115 of each assembly direct the vortices generated by each fin 115, by mutual interaction, to the upper surface 105c of the blade 105, so as to more effectively prevent local detachment that can cause a swirl of corner.
• the vortex created by each fin 115 is reinforced by that of the fin 115 directly downstream, which also slightly modifies the direction of the reinforced vortex towards the axis of its rope.
• both the axial offset d x and the lateral offset d y are the same between the first and the second fin 115 as between the second and third fins 115 of each set, it is also it is conceivable to have different offsets between the different rows of vortex generation devices downstream of the vane.
• a compressor element 200 also comprises a straightening vane 203 in the form of a stator, with a plurality of blades 205 arranged radially about a central axis X, and staggered from each other in a lateral direction, that is to say circumferential.
• This compressor element 200 is also intended to be situated directly downstream of a rotor (not illustrated) rotating around the central axis X, in order to straighten the flow of the working fluid downstream of the rotor towards an axial direction substantially parallel to the central axis X and perpendicular to the lateral direction.
• each blade 205 has a blade root 205a integral with an inner shell 208, and a blade head 205b integral with an outer shell 207.
• the set of three vortex generating devices 215 is located upstream of each blade head 205a.
• these fins 215 is, for the remainder, substantially similar to that of the fins of the first embodiment, with a relatively low angle of attack, for example between 5 and 15 degrees, with respect to the flow of fluid, a height of l 2 to 8% of that of the blades 205, and axial and lateral offsets between each pair of adjacent fins.
• the fins 215 may in particular have been molded in one piece with the outer shell 207 and the rest of the righting vane 203, and possibly subjected to a recovery finish at the foundry outlet, or have were made separately and then fixed by conventional means on the outer shell 207. Alternatively, however, they may have been machined in the mass of the outer shell 207.
• a compressor element 300 comprises a rotor-like rotor blade 302, with a plurality of blades 304 arranged radially about a central axis X, and staggered together. others in a lateral, i.e., circumferential direction.
• This compressor element 300 is intended to rotate around the central axis X, in order to impulse a working fluid whose flow will then be straightened towards an axial direction, substantially parallel to the central axis X and perpendicular to the direction lateral, by a straightening vane forming a fixed stator (not shown).
• each blade 304 has a blade root 304a integral with a hub 306, and a blade head 304b, and the set of three vortex generating devices 315 is located upstream of each foot. blade 304a, in order to at least partially prevent the formation of corner vortices in the rotor 302.
• these fins 315 is, for the rest, substantially similar to that of the fins of the previous embodiments with a relatively low angle of attack, for example between 5 and 15 degrees, relative to the fluid flow, a height of the order of 2 to 8% of that of the blades 305, and axial and lateral offsets between each pair of adjacent fins.
• they may have been machined in the hub 306.
• they may alternatively have been integrally molded with the hub 306 and the remainder of the rotor 302, and possibly subjected to finishing at the outlet of the foundry , or have been manufactured separately and then fixed by conventional means on the hub 306.
• the vortex generating devices are arranged on compressor elements, it is also possible to apply the same principle.
• FIG. 8 a turbine stage 401 comprising a first turbine element 400a with a stator-shaped fixed guide blade 403 and, downstream thereof, a second turbine element 400b with a moving blade. 402 in the form of a rotor.
• the guide vane 403 has a plurality of blades 405 arranged radially about a central axis X, and offset from each other in a lateral, i.e., circumferential direction.
• each vane 405 has a vane root 405a integral with an inner ferrule 408, and a vane head 405b integral with an outer ferrule 407.
• this first turbine element 400 also comprises a set of three devices 415a vortex generation upstream of each blade root 405a, in the form of straight fins integral with the inner ferrule 408, and a set of three vortex generation devices 415b upstream of each vane head 405b, in the form of straight vanes integral with the outer ferrule 407.
• these two sets of vanes 415a and 415b is, for the rest, substantially similar to that of the fins of the first and second embodiments, with a relatively high angle of attack low, for example between 5 and 15 degrees, relative to the fluid flow, a height of the order of 2 to 8% of that of the blades 405, and axial and lateral offsets between each pair of adjacent fins. They may also have been manufactured by the same production processes.
• the second turbine element 400b located downstream of the guide vane 403, has a rotor-like moving blade 402, with a plurality of blades 404 arranged radially about the central axis X, and offset from each other. others in the lateral direction.
• This second turbine element 400b is intended to rotate about the central axis X, driven by the fluid flow.
• each blade 404 has a blade root 404a integral with a hub 406, and a blade head 404b, and the set of three vortex generating devices 415c is located upstream of each blade root 404a, to at least partially prevent the formation of corner vortices in the rotor 402.
• these fins 415c is, for the rest, substantially similar to that of the fins of the embodiments preceding, with a relatively low angle of attack, for example between 5 and 15 degrees, relative to the fluid flow, a height of the order of 2 to 8% of that of the blades 404, and axial offsets and lateral between each pair of adjacent fins. They may also have been manufactured by the same production processes.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Physics & Mathematics (AREA)
• Fluid Mechanics (AREA)
• Geometry (AREA)
• Structures Of Non-Positive Displacement Pumps (AREA)
• Turbine Rotor Nozzle Sealing (AREA)

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Citations (6)

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• 2011
  • 2011-06-14 FR FR1155158A patent/FR2976634B1/fr active Active
• 2012
  • 2012-06-11 US US14/125,454 patent/US9726197B2/en active Active
  • 2012-06-11 EP EP12731128.0A patent/EP2721306B1/fr active Active
  • 2012-06-11 RU RU2014100895/06A patent/RU2598970C2/ru active
  • 2012-06-11 JP JP2014515256A patent/JP6034860B2/ja active Active
  • 2012-06-11 CN CN201280029443.2A patent/CN103608593B/zh active Active
  • 2012-06-11 WO PCT/FR2012/051306 patent/WO2012172246A1/fr active Application Filing
  • 2012-06-11 BR BR112013030931-8A patent/BR112013030931B1/pt active IP Right Grant
  • 2012-06-11 CA CA2837819A patent/CA2837819C/fr active Active

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